Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
WIGWAM CHICK
These yellow fluffy lumps who only does not offend in the poultry yard. Kvochka has no time to ward off bullies or to hide them from the attacks of birds of prey. It is easy to help if...
Buggies for training and sports
Many youth technical stations have their karting sections. The kids who train in these sections build and improve their karts themselves, achieving very good results in competitions. So...
